Total ballbar dynamic tests for five-axis CNC machine tools |
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| Authors: | W.T. Lei I.M. Paung Chen-Chi Yu |
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| Affiliation: | 1. State Key Laboratory of Tribology and Department of Mechanical Engineering, Tsinghua University, Beijing, 100084, China;2. School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China;1. State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, PR China;2. National NC System Engineering Research Center, Huazhong University of Science and Technology, Wuhan 430074, PR China;1. Key Laboratory of Mathematics Mechanization, Chinese Academy of Sciences, Beijing 100190, China;2. Manufacturing Automation Laboratory, The University of British Columbia, Vancouver, BC, Canada V6T1Z4;1. School of Electrical Engineering and Automation, Tianjin University, 300072 Tianjin, People''s Republic of China;2. Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, 300072 Tianjin, People''s Republic of China;3. School of Mechanical Engineering, Tianjin University, 300072 Tianjin, People''s Republic of China |
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| Abstract: | The linear and rotary axes of a five-axis machine tool are driven simultaneously to generate a specified tool position and orientation in workpiece coordinates. It is crucial that these servo-controlled axes are of balanced dynamics to achieve high tracking accuracy. In this paper, ballbar circular tests for all possible combinations of linear and rotary axes of a five-axis machine tool are investigated and total ballbar dynamic tests are proposed. Through the relational arrangement of the test sequence, the total ballbar dynamic tests can be employed to identify dynamic differences between linear and rotary axes. More importantly, the velocity gains of the position control loops of all servo-controlled linear and rotary axes can be tuned synchronously to eliminate gain mismatch errors. Experimental results have proved the effectiveness of the new methods. |
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